Bushwalkers Rescued from Heathcote NP

[Overlandman]

From ABC
http://www.abc.net.au/news/2013-08-11/b ... rk/4878630

Police have rescued nine people, aged in their 60s, who failed to return from a bushwalk at a national park south of Sydney.

Two helicopters and the police dog squad started searching Heathcote National Park after the group was reported missing at 5:30pm (AEST) yesterday.
Officers found the group about 10pm and later winched some of them to a local oval.
One person was treated for a minor knee injury and another for mild hypothermia.
Police have renewed their appeal to anyone entering the bush, even if for a short walk, to take a Personal Locator Beacon (PLB), appropriate clothing, water and food.
Bushwalkers are also urged to register their planned route and tell friends and family when they are expected to return.

[GPSGuided]

Anyone know more? Where and how did they lose their path? Always good to learn from others' errors.